Magnetic Orientational Properties of Monosodium Urate Crystals

Takeuchi, Yahiko; Sekiya, Minoru; Hamasaki, Atom; Iwasaka, Masakazu; Matsuda, Masaki

doi:10.1109/tmag.2017.2726525

Cited by 7 publications

(7 citation statements)

References 22 publications

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“…In contrast, the MSU crystals oriented so that their long direction was not parallel to the magnetic-field direction. The orientation behavior of MSU crystals has been previously reported, and the behavior was the same [Takeuchi et al, 2017].…”

Section: Resultssupporting

confidence: 57%

“…The solid line in Figure 4a shows superposition of the magnetic‐field dependence of the order parameter S on the measured results when | x Δ χ | = 2.0 × 10 −8 using the calculated results shown in Figure 6. That is, |Δχ| = 2.0 × 10 −8 is sufficient to cause a crystal of this size to approach the saturated orientation at ≥0.5 T. If the anisotropy is |Δ χ | = 1.0 × 10 −7 , perfect orientation of the crystals is expected at 0.3 T. MSU crystals have been estimated to have magnetic anisotropy on the order of 10 −7 [Takeuchi et al, 2017]. The solid line in Figure 4b shows the magnetic‐field dependence of S compared with the measured results when |Δ χ | = 1.0 × 10 −7 , again using the calculated results shown in Figure 6, and the results are in good agreement.…”

Section: Resultsmentioning

confidence: 99%

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Differences in the Optical Response of MSU and CPP Crystals During Magnetic Orientation: Possibility of Diagnosing Gout and Pseudogout

Takeuchi

Yoshikawa

Mitsui

et al. 2023

Bioelectromagnetics

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Pseudogout is crystalline arthritis. It has a similar clinical picture to that of gout, and it is difficult to distinguish the two diseases using conventional analysis methods. However, it is important to identify the different crystals responsible for these two cases because the treatment strategies are different. In a previous study, we reported magnetic orientation of monosodium urate (MSU) crystals, which are the causative agent of gout, at the permanent magnet level. In this study, we investigated the effect of an applied magnetic field on calcium pyrophosphate (CPP) crystals, which are the causative agent of pseudogout, and the difference in the magnetic responses of CPP and MSU crystals. We found that the CPP crystals were oriented in a magnetic field on milli‐Tesla order because of the anisotropy of the diamagnetic susceptibility. In addition, the CPP crystals exhibited different anisotropic magnetic properties from those of MSU crystals, which led to a characteristic difference between the orientations of the two crystals. That is, we found that the causative agents of gout and pseudogout responded differently to a magnetic field. This report suggests that the discrimination between CPP and MSU by optical measurements is possible by application of magnetic fields appropriately. © 2023 Bioelectromagnetics Society.

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Section: Resultssupporting

confidence: 57%

Section: Resultsmentioning

confidence: 99%

Differences in the Optical Response of MSU and CPP Crystals During Magnetic Orientation: Possibility of Diagnosing Gout and Pseudogout

Takeuchi

Yoshikawa

Mitsui

et al. 2023

Bioelectromagnetics

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“…176,177 There are highly anisotropic diamagnetic particles, which can be aligned with an electromagnet or permanent magnet. For example, the needle-shaped monosodium urate (MSU) crystal has large magnetic anisotropy and can be oriented with a low magnetic field of 0.5 T. 178,179 MSU crystals develop in the joint and cause gout. Takeuchi et al 180 reported a technique to detect MSU crystals by utilizing the magnetic orientation, aiming to develop a non-invasive diagnostic method for gout.…”

Section: Application Of Magnetic Torquementioning

confidence: 99%

Applications of magnetic and electromagnetic forces in micro-analytical systems

2023

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“…For example, cuprate superconductors, carbon microcrystals, biological guanine crystals, and even monosodium urate crystals that cause gout can undergo low magnetic fieldinduced orientation. [10][11][12][13][14][15][16] The orientation of carbon crystallites reduces energy consumption during graphite preparation, and improves the quality. [17][18][19] Guanine crystals can be used for microelectromechanical optical bio-reflectors.…”

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confidence: 99%

Development of a quadrupole magnet for a mechanical-part-free rotational magnetic field

Takeuchi¹,

Kawaguchi²,

Matsuda³

et al. 2021

Appl. Phys. Express

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If the properties or morphologies of a material are optimized, magnetic orientation occurs even at the electromagnet level. To apply a rotational magnetic field, we used finite-integration technique to design a quadrupole electromagnet based on estimated magnetic field-strength distributions and magnetic flux vectors. The generation of a seamless 0.33 T rotating magnetic field without moving parts is demonstrated. It will be possible to adopt it for targets, such as material preparations or body parts, that cannot be examined with the conventional turntable method.

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Magnetic Orientational Properties of Monosodium Urate Crystals

Cited by 7 publications

References 22 publications

Differences in the Optical Response of MSU and CPP Crystals During Magnetic Orientation: Possibility of Diagnosing Gout and Pseudogout

Differences in the Optical Response of MSU and CPP Crystals During Magnetic Orientation: Possibility of Diagnosing Gout and Pseudogout

Applications of magnetic and electromagnetic forces in micro-analytical systems

Development of a quadrupole magnet for a mechanical-part-free rotational magnetic field

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